1 files changed, 50 insertions, 0 deletions
diff --git a/pre_commit/languages/swift.py b/pre_commit/languages/swift.py
new file mode 100644
index 0000000..f7bfe84
--- /dev/null
+++ b/pre_commit/languages/swift.py
@@ -0,0 +1,50 @@
+from __future__ import annotations
+
+import contextlib
+import os
+from collections.abc import Generator
+from collections.abc import Sequence
+
+from pre_commit import lang_base
+from pre_commit.envcontext import envcontext
+from pre_commit.envcontext import PatchesT
+from pre_commit.envcontext import Var
+from pre_commit.prefix import Prefix
+from pre_commit.util import cmd_output_b
+
+BUILD_DIR = '.build'
+BUILD_CONFIG = 'release'
+
+ENVIRONMENT_DIR = 'swift_env'
+get_default_version = lang_base.basic_get_default_version
+health_check = lang_base.basic_health_check
+run_hook = lang_base.basic_run_hook
+
+
+def get_env_patch(venv: str) -> PatchesT:  # pragma: win32 no cover
+    bin_path = os.path.join(venv, BUILD_DIR, BUILD_CONFIG)
+    return (('PATH', (bin_path, os.pathsep, Var('PATH'))),)
+
+
+@contextlib.contextmanager  # pragma: win32 no cover
+def in_env(prefix: Prefix, version: str) -> Generator[None, None, None]:
+    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
+    with envcontext(get_env_patch(envdir)):
+        yield
+
+
+def install_environment(
+        prefix: Prefix, version: str, additional_dependencies: Sequence[str],
+) -> None:  # pragma: win32 no cover
+    lang_base.assert_version_default('swift', version)
+    lang_base.assert_no_additional_deps('swift', additional_dependencies)
+    envdir = lang_base.environment_dir(prefix, ENVIRONMENT_DIR, version)
+
+    # Build the swift package
+    os.mkdir(envdir)
+    cmd_output_b(
+        'swift', 'build',
+        '--package-path', prefix.prefix_dir,
+        '-c', BUILD_CONFIG,
+        '--build-path', os.path.join(envdir, BUILD_DIR),
+    )